计算机科学 ›› 2011, Vol. 38 ›› Issue (Z10): 392-393.

• 无线网络与通信技术 • 上一篇    下一篇

单向链路故障检测的研究

韩倩,程友清   

  1. (光纤通信技术和网络国家实验室烽火网络有限公司 武汉430074)
  • 出版日期:2018-11-16 发布日期:2018-11-16

Research of UniDirectional Link Detection

HAN Qian,CHENG You-qing   

  • Online:2018-11-16 Published:2018-11-16

摘要: UDLD(UniDircctional Link Dctcction,单向链路检测)是一个Cisco私有的二层协议,用于监听利用光纤或双绞线连接的以太链路的物理配置,检测以太网交换机之间的单向链路故障,防止生成树引起的回环问题的发生。UDLD通过周期性地向对端端口发送UDLD报文,并接收解析对端端口发送的UDLD报文来进行单向链路的检测。UDLD需要链路两端设备都支持才能正常运行。当检测到单向链路故障时,UDLI)会关闭相应接口并发送警告信息。

关键词: 单向链路检测,子网访问协议,类型长度值

Abstract: UDLD is a layer protocol that enables devices connected through fiber-optic or twisted-pair Ethernet cables.It monitors a physical connection to detect unidirectional links to avoid spanning-tree topology loops or silent drop traffic. All connected devices must support UDLD for the protocol to successfully identify the unidirectional links. When UDLD detects a unidirectional link, it can administratively shut down the affected port and send you a warning message.

Key words: UDLD, SNAP, TLV

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